Thank you for all your replies!
Here are some more information :
-I don't really care about Caller ID name
. But my contacts need to see my phone number when I call them (or they wont answer). Skype, for instance, wouldn't be a solution.
-Of course, I did my homeworks, and they all seems to accept to port my phone number.
-I don't really care about entry fees. FPL, for instance, has a 75$ starting fee, but it is really cheap on the long run. I saw that porting a number on Anveo is cheaper than on Voip.ms, but they has a 911 fee. Those CallCenter and Voip.ms too? I found it hard to get the real price of each services, as there website are not really clear. They all give SIP configuration for free?
@PX Eliezer You are right, I'm not the best customer they can dream of
But I already have FPL voip + cellphone + doing a lot of skype. I want to port a new number to VoIP because I don't want to lose it and I know that I wont use it often. This is why I don't really care about entry fees, but I don't want to pay on the long run. And did you check FreePhoneLine? They offer a free phone number with voicemail and callerID + most of canadian cities are free and low rates outside those free areas. But may be they wont be in business for long (they are powered by fongo)!